下列矿区与主要矿产搭配正确的是[ ]
A．平顶山——石油
B．大冶——铁矿
C．德兴——铬矿
D．金昌——金矿
答案：B
Although he felt a little sleepy, ______ he had to kept ______ for another two hours. [ ]
A. /; driving
B./; to driving
C. but; to drive
D. but; driving
程控室如何对现场犁煤器进行控制？
